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中国沙漠 ›› 2025, Vol. 45 ›› Issue (6): 103-112.DOI: 10.7522/j.issn.1000-694X.2025.00048

• • 上一篇    

甘肃省干旱演变特征及主导因子

李晓鹏1(), 李康1, 李贺2   

  1. 1.兰州财经大学 农林经济管理学院,甘肃 兰州 730000
    2.商丘学院 计算机工程学院,河南 商丘 476000
  • 收稿日期:2025-03-31 修回日期:2025-04-14 出版日期:2025-11-20 发布日期:2025-11-26
  • 作者简介:李晓鹏(1981—),女,甘肃天水人,博士,副教授,研究方向为生态环境与区域发展。E-mail: lixiaopeng1396@163.com
  • 基金资助:
    甘肃省科技计划(自然科学基金)项目(24JRRA1003);甘肃省教育厅青年博士支持项目(2025QB-055);甘肃省陇原青年人才创新创业项目(2021LQGR59);甘肃省高等学校人才培养质量提升项目(新农科背景下农林经济管理专业“四维融合”人才培养模式改革与实践)

Analysis of evolution characteristics of drought and its dominant factors in Gansu,China

Xiaopeng Li1(), Kang Li1, He Li2   

  1. 1.College of Agricultural and Forestry Economics and Management,Lanzhou University of Finance and Economics,Lanzhou 730000,China
    2.College of Computer Engineering,Shangqiu University,Shangqiu 476000,Henan,China
  • Received:2025-03-31 Revised:2025-04-14 Online:2025-11-20 Published:2025-11-26

摘要:

甘肃省位于中国西北干旱与半干旱带,其干旱时空演变对区域生态安全和农业可持续发展具有重要影响。本研究基于2000—2022年MODIS数据的增强型植被指数(EVI)与地表温度(LST),构建温度植被干旱指数(TVDI),反演甘肃省近23年干旱强度空间格局。通过Sen趋势分析法与Mann-Kendall(M-K)显著性检验,系统解析干旱演变特征。进一步引入Hurst指数结合趋势分析结果预测未来干旱演变趋势,并运用地理探测器模型探究干旱驱动机制。结果表明:(1)2000—2022年甘肃省年均TVDI值为0.57,整体呈轻旱水平,干旱面积占比达82.18%;(2)甘肃省TVDI年均下降0.0005,干旱显著缓解区域集中于祁连山东麓、甘南高原及陇东地区;(3)Hurst指数结合Sen趋势分析预测显示,未来54.9%的区域将向湿润化转变,反持续性特征显著;(4)地理探测器模型表明,高程和气温是干旱的主控因子,其交互作用增强了解释力。

关键词: 甘肃省, TVDI, Hurst指数, 地理探测器

Abstract:

Gansu Province, located in the arid and semi-arid transition zone of northwestern China, experiences significant spatiotemporal variations in drought that profoundly impact regional ecological security and agricultural sustainability. This study constructed a Temperature Vegetation Drought Index (TVDI) model based on Enhanced Vegetation Index (EVI) and Land Surface Temperature (LST) data from MODIS (2000-2022) to analyze the spatial patterns of drought intensity in Gansu Province over 23 years. The Sen trend analysis and Mann-Kendall (M-K) significance test were employed to examine drought evolution characteristics. The Hurst index combined with Sen trend analysis was used to predict future drought trends, and the Geodetector model was applied to explore the driving mechanisms of drought. The results indicate that: (1) The annual average TVDI value in Gansu Province from 2000 to 2022 was 0.57, indicating a mild drought level, with drought-affected areas accounting for 82.18% of the total area; (2) The annual TVDI decline rate was 0.0005, with significant drought alleviation observed in the eastern foothills of the Qilian Mountains, the Gannan Plateau, and the Longdong region; (3) The Hurst index combined with Sen trend analysis predicts that 61.4% of the study area will transition to a wetter state in the future, showing significant anti-persistence characteristics; (4) The Geodetector model reveals that elevation and temperature are the dominant factors driving drought, and their interaction significantly enhances explanatory power. These findings provide a scientific basis for drought risk early warning and ecological adaptive management in Gansu Province.

Key words: Gansu Province, TVDI, Hurst index, Geodetector

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